<template>
  <el-menu :default-active="activeMenu" mode="horizontal" @select="handleSelect" :ellipsis="false">
    <template v-for="(item, index) in topMenus">
      <el-menu-item :style="{ '--theme': theme }" :index="item.path" :key="index" v-if="index < visibleNumber">
        <svg-icon v-if="item.meta && item.meta.icon && item.meta.icon !== '#'" :icon-class="item.meta.icon" />
        {{ item.meta.title }}
      </el-menu-item>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-sub-menu :style="{ '--theme': theme }" index="more" v-if="topMenus.length > visibleNumber">
      <template #title>更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
          <svg-icon v-if="item.meta && item.meta.icon && item.meta.icon !== '#'" :icon-class="item.meta.icon" />
          {{ item.meta.title }}
        </el-menu-item>
      </template>
    </el-sub-menu>
  </el-menu>
</template>

<script setup>
  import { constantRoutes } from '@/router';
  import { isHttp } from '@/utils/validate';
  import useAppStore from '@/store/modules/app';
  import useSettingsStore from '@/store/modules/settings';
  import usePermissionStore from '@/store/modules/permission';

  // 顶部栏初始数
  const visibleNumber = ref(null);
  // 当前激活菜单的 index
  const currentIndex = ref(null);
  // 隐藏侧边栏路由
  const hideList = ['/index', '/user/profile'];

  const appStore = useAppStore();
  const settingsStore = useSettingsStore();
  const permissionStore = usePermissionStore();
  const route = useRoute();
  const router = useRouter();

  // 主题颜色
  const theme = computed(() => settingsStore.theme);
  // 所有的路由信息
  const routers = computed(() => permissionStore.topbarRouters);

  // 顶部显示菜单
  const topMenus = computed(() => {
    let topMenus = [];
    routers.value.map((menu) => {
      if (menu.hidden !== true) {
        // 兼容顶部栏一级菜单内部跳转
        if (menu.path === '/') {
          topMenus.push(menu.children[0]);
        } else {
          topMenus.push(menu);
        }
      }
    });
    return topMenus;
  });

  // 设置子路由
  const childrenMenus = computed(() => {
    let childrenMenus = [];
    routers.value.map((router) => {
      for (let item in router.children) {
        if (router.children[item].parentPath === undefined) {
          if (router.path === '/') {
            router.children[item].path = '/' + router.children[item].path;
          } else {
            if (!isHttp(router.children[item].path)) {
              router.children[item].path = router.path + '/' + router.children[item].path;
            }
          }
          router.children[item].parentPath = router.path;
        }
        childrenMenus.push(router.children[item]);
      }
    });
    return constantRoutes.concat(childrenMenus);
  });

  // 默认激活的菜单
  const activeMenu = computed(() => {
    const path = route.path;
    let activePath = path;
    if (path !== undefined && path.lastIndexOf('/') > 0 && hideList.indexOf(path) === -1) {
      const tmpPath = path.substring(1, path.length);
      activePath = '/' + tmpPath.substring(0, tmpPath.indexOf('/'));
      if (!route.meta.link) {
        appStore.toggleSideBarHide(false);
      }
    } else if (!route.children) {
      activePath = path;
      appStore.toggleSideBarHide(true);
    }
    activeRoutes(activePath);
    return activePath;
  });

  function setVisibleNumber() {
    const width = document.body.getBoundingClientRect().width / 3;
    visibleNumber.value = parseInt(width / 85);
  }

  function handleSelect(key, keyPath) {
    currentIndex.value = key;
    const route = routers.value.find((item) => item.path === key);
    if (isHttp(key)) {
      // http(s):// 路径新窗口打开
      window.open(key, '_blank');
    } else if (!route || !route.children) {
      // 没有子路由路径内部打开
      const routeMenu = childrenMenus.value.find((item) => item.path === key);
      if (routeMenu && routeMenu.query) {
        let query = JSON.parse(routeMenu.query);
        router.push({ path: key, query: query });
      } else {
        router.push({ path: key });
      }
      appStore.toggleSideBarHide(true);
    } else {
      // 显示左侧联动菜单
      activeRoutes(key);
      appStore.toggleSideBarHide(false);
    }
  }

  function activeRoutes(key) {
    let routes = [];
    if (childrenMenus.value && childrenMenus.value.length > 0) {
      childrenMenus.value.map((item) => {
        if (key == item.parentPath || (key == 'index' && '' == item.path)) {
          routes.push(item);
        }
      });
    }
    if (routes.length > 0) {
      permissionStore.setSidebarRouters(routes);
    } else {
      appStore.toggleSideBarHide(true);
    }
    return routes;
  }

  onMounted(() => {
    window.addEventListener('resize', setVisibleNumber);
  });
  onBeforeUnmount(() => {
    window.removeEventListener('resize', setVisibleNumber);
  });

  onMounted(() => {
    setVisibleNumber();
  });
</script>

<style lang="scss">
  .topmenu-container.el-menu--horizontal > .el-menu-item {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 5px !important;
    margin: 0 10px !important;
  }

  .topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
  .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
    border-bottom: 2px solid #{'var(--theme)'} !important;
    color: #303133;
  }

  /* sub-menu item */
  .topmenu-container.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 5px !important;
    margin: 0 10px !important;
  }

  /* 背景色隐藏 */
  .topmenu-container.el-menu--horizontal > .el-menu-item:not(.is-disabled):focus,
  .topmenu-container.el-menu--horizontal > .el-menu-item:not(.is-disabled):hover,
  .topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title:hover {
    background-color: #ffffff !important;
  }

  /* 图标右间距 */
  .topmenu-container .svg-icon {
    margin-right: 4px;
  }

  /* topmenu more arrow */
  .topmenu-container .el-sub-menu .el-sub-menu__icon-arrow {
    position: static;
    vertical-align: middle;
    margin-left: 8px;
    margin-top: 0px;
  }
</style>
